Sheffield United have moved a step closer to signing their fourth player of the summer.
Talks between the two clubs are understood to have progressed over the weekend, after Chris Wilder's squad returned from a pre-season training camp in Portugal where they beat Real Betis in a friendly.
Although officials acting on the United manager's behalf are scheduled to hold further discussions with their counterparts at Forest before Tuesday's visit to Burton Albion, sources in the East Midlands last night reported an agreement is expected to be finalised shortly.
Osborn, aged 24, has made over 200 first team appearances since moving to the City Ground in 2003. A former England youth international, he started his career with Forest's arch-rivals Derby County and was named their player of the season in 2018.